U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 17651 - 17675 of 74100

A Low-Cost Time Transfer Receiver for Contributions to Coordinated Universal Time

November 6, 2014
Author(s)
Michael A. Lombardi, Andrew N. Novick, Victor S. Zhang
This paper describes a low-cost time transfer receiver that allows timing laboratories, including national metrology institutes and other designated institutions, to contribute data to the computation of Coordinated Universal Time (UTC). The time transfer

Fast transport of mixed-species ion chains within a Paul trap

November 6, 2014
Author(s)
Ryan S. Bowler, M. Palmer, John P. Gaebler, Dietrich G. Leibfried, J. G. Ceremuga
We investigate the dynamics of mixed-species ion crystals during transport between spatially distinct locations in a linear Paul trap in the diabatic regime. In a general mixed-species crystal, all degrees of freedom along the direction of transport are

NIST 10 V Programmable Josephson Voltage Standard System Using a Low Capacity Cryocooler

November 6, 2014
Author(s)
Logan A. Howe, Anna Fox, Alain Rufenacht, Charles J. Burroughs, Paul Dresselhaus, Samuel Benz, Robert E. Schwall
Rising costs of and difficulty in obtaining liquid helium in many areas of the world provides strong motivation for cryogen-free operation of superconducting devices such as NIST Programmable Josephson Voltage Standard (PJVS) systems. However, operation on

The Metrology of a Rastered Spot of X Rays used in Security Screening

November 6, 2014
Author(s)
Lawrence T. Hudson, Jack L. Glover, Ronaldo Minniti
In recent times, ionizing radiation has been used around the world to screen persons for non- medical purposes, namely to detect bulk explosives or other contraband hidden on the body including materials not registered by metal detectors. In contrast to

Energy Transfer Between Eigenmodes in Multimodal Atomic Force Microscopy

November 5, 2014
Author(s)
Sang M. An, Santiago D. Solares Rivera, Sergio Santos, Daniel Ebeling
We present experimental and computational investigations of tetramodal and pentamodal atomic force microscopy (AFM), respectively, whereby the first four or five flexural modes of the cantilever are simultaneously excited externally. This leads to six to

Checking the Net Content of Packaged Goods (NIST HB 133-2015)

November 4, 2014
Author(s)
Linda D. Crown, David A. Sefcik, Lisa Warfield
This handbook has been prepared as a procedural guide for the compliance testing of net contents statements on packaged goods. Compliance testing of packaged goods is the determination of the conformance results of the packaging, distribution, and

SRM November Spotlight 2014

November 4, 2014
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Office of Reference Materials for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

Archaeal DNA replication

November 3, 2014
Author(s)
Zvi Kelman, Lori M. Kelman
DNA replication is an essential process for all life forms. While the process is fundamentally conserved in the three domains of life, bioinformatics, biochemical, structural and genetic studies have demonstrated that the process and the proteins involved

Classical simulation of Yang-Baxter gates

November 3, 2014
Author(s)
Stephen P. Jordan, Gorjan Alagic, Aniruddha Bapat
A unitary operator that satisfies the constant Yang-Baxter equation immediately yields a unitary representation of the braid group Bn for every n ≥ 2. If we view such an operator as a quantum-computational gate, then topological braiding corresponds to a

Fast Neutron Detection with a Segmented Spectrometer

November 3, 2014
Author(s)
Jeffrey S. Nico, T J. Langford, Christopher D. Bass, H Breuer, Craig Heimbach, D. K. Erwin
A fast neutron spectrometer consisting of segmented plastic scintillator and He-3 proportional counters was constructed for the measurement of neutrons in the energy range 1 MeV to 200 MeV. We discuss its design, principles of operation, and the method of

Functorial Data Migration: From Theory to Practice

November 3, 2014
Author(s)
Eswaran Subrahmanian, Ryan Wisnesky, David Spivak, Patrick Schultz
In this paper we describe a functorial data migration [6] scenario about the manufacturing service capability of a distributed supply chain. The scenario is a category-theoretic analog of an OWL ontology-based \semantic enrichment" scenario [5] developed

International Key Comparison of Neutron Fluence Measurements in Monoenergetic Neutron Fields – CCRI(III)-K11

November 3, 2014
Author(s)
Maynard S. Dewey, V. Gressier, A. C. Bonaldi, David M. Gilliam, H. Harano, A. Masuda, T Matsumoto, N. Moiseev, Jeffrey S. Nico, R. Notle, S. Oberstedt, N. J. Roberts, S. Rottger, D. J. Thomas
To ensure the validity of their national standards, National Metrology Institutes, NMIs, participate regularly in international comparisons. In the area of neutron metrology, Section III of the Consultative Committee for Ionizing Radiation is in charge of

Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshape near 2.06 um

November 3, 2014
Author(s)
Thinh Q. Bui, David Long, Agata Cygan, Vincent T. Sironneau, Daniel Hogan, Priyanka M. Rapusinghe, Mitchio Okumura
Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was used to study CO2 lineshapes in the (20013)←(00001) band centered near 2.06 um. Two rovibrational transitions were chosen for this study to measure non-Voigt collisional effects for air

Scattering resonances and bound states for strongly interacting Rydberg polaritons

November 3, 2014
Author(s)
Przemek Bienias, Soonwon Choi, Ofer Firstenberg, Mohammad F. Maghrebi, Mikhail Lukin, Alexey Gorshkov, Hans Peter Buchler
We provide a rigorous framework describing a low-density gas of slow-light polaritons propagating in one dimension under the conditions of electromagnetically induced transparency and interacting via strong Rydberg-Rydberg interactions. Specifically, we

Which resonances in small metallic nanoparticles are plasmonic?

November 3, 2014
Author(s)
Emily Townsend, Garnett W. Bryant
We use time-dependent density functional theory to examine the character of various resonances corresponding to peaks in the optical response of small metallic nanoparticles. Each resonance has both "sloshing" and "inversion" character. The sloshing mode

ATMP-Stabilized Iron Nanoparticles: Chelator-Controlled Nanoparticle Synthesis

November 1, 2014
Author(s)
Lauren F. Greenlee, Nikki S. Rentz, Roy H. Geiss
Iron nanoparticles are of interest in fields such as water treatment and alternative energy due to their reactive properties and low cost. When combined with other metals, iron-metal nanoparticles can act as catalysts for a diverse set of reactions. In

Change in the Magnetic Structure of (Bi,Sm)FeO 3 Thin Films at the Morphotropic Phase Boundary Probed by Neutron Diffraction

November 1, 2014
Author(s)
Shingo Maruyama, Varatharajan Anbusathaiah, Amy Fennell, Mechthild Enderle, Ichiro Takeuchi, William D. Ratcliff
We report on the evolution of the magnetic structure of BiFeO 3 thin films grown on SrTiO 3 substrates as a function of Sm doping. We determined the magnetic structure using neutron diffration. We found that as Sm increases, the magnetic structure evolves

Details of the Magnetization Reversal in Patterned Exchange-biased and Unbiased Thin Films

November 1, 2014
Author(s)
Robert D. Shull, Y. P. Kabanov, Andrew P. Chen, Cindi L. Dennis, V S. Gornakov, Valerian I. Nikitenko
New features of the magnetization reversal of a patterned bilayer in the form of a square mesh consisting of 16 um wide intersecting stripes of Ni(sub79)Fe(sub21) (30 nm) exchange-coupled with IrMn (10 um) on top were revealed via use of the advanced
Displaying 17651 - 17675 of 74100